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In Situ Generation of Few-Layer Graphene Coatings on SnO2-SiC Core-Shell Nanoparticles for High-Performance Lithium-Ion Storage

Authors

  • Zhongxue Chen,

    1. Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China
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  • Min Zhou,

    1. Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China
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  • Yuliang Cao,

    Corresponding author
    1. Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China
    2. Pacific Northwest National Laboratory, Richland, WA 99352, USA
    • Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China
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  • Xinping Ai,

    1. Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China
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  • Hanxi Yang,

    1. Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China
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  • Jun Liu

    Corresponding author
    1. Pacific Northwest National Laboratory, Richland, WA 99352, USA
    • Pacific Northwest National Laboratory, Richland, WA 99352, USA.
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Abstract

A simple ball-milling method is used to synthesize a tin oxide-silicon carbide/few-layer graphene core-shell structure in which nanometer-sized SnO2 particles are uniformly dispersed on a supporting SiC core and encapsulated with few-layer graphene coatings by in situ mechanical peeling. The SnO2-SiC/G nanocomposite material delivers a high reversible capacity of 810 mA h g−1 and 83% capacity retention over 150 charge/discharge cycles between 1.5 and 0.01 V at a rate of 0.1 A g−1. A high reversible capacity of 425 mA h g−1 also can be obtained at a rate of 2 A g−1. When discharged (Li extraction) to a higher potential at 3.0 V (vs. Li/Li+), the SnO2-SiC/G nanocomposite material delivers a reversible capacity of 1451 mA h g−1 (based on the SnO2 mass), which corresponds to 97% of the expected theoretical capacity (1494 mA h g−1, 8.4 equivalent of lithium per SnO2), and exhibits good cyclability. This result suggests that the core-shell nanostructure can achieve a completely reversible transformation from Li4.4Sn to SnO2 during discharging (i.e., Li extraction by dealloying and a reversible conversion reaction, generating 8.4 electrons). This suggests that simple mechanical milling can be a powerful approach to improve the stability of high-performance electrode materials involving structural conversion and transformation.

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